Affiliation: | 1. Respiratory Failure Unit, G. Papanikolaou Hospital, Exohi 57010, Thessaloniki, Greece 2. Sleep Laboratory, Department of Internal Medicine, “St. Paul” General Hospital, Thessaloniki, Greece 3. Department of Cardiology, “St. Paul” General Hospital, Thessaloniki, Greece 4. Department of Clinical Neurophysiology, Psychiatric Hospital Thessaloniki, Thessaloniki, Greece
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